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To be clear, I created the project via the STS File->New->Spring Template Project->Roo... Wizard, and then added all my entities and such, and then when I ran any of the 'perform' commands, I got the error above.

This is indeed not working correctly. I notice that you have already created a couple of Jira tickets regarding Roo - STS tooling integration, so it may make sense if you could also add this one.

I am not an Eclipse / STS internals expert but I would guess that most of the maven commands are better used through the m2eclipse plugin included in STS rather than the shell commands. But you are right if the commands are visible in the STS Roo shell they should either work or not be available in the first place.